Packing sheet overlaying device for offset printing machine

Claim 1

A packing sheet overlaying device for an offset printing machine comprising: a printing machine cylinder; a cam lever shaft provided parallel to a longitudinal opening in said printing machine cylinder; a cam lever provided at one end of said cam lever shaft, said cam lever shaft being turned by said cam lever, said cam lever having a cam follower; a fixed cam having cam surfaces of different levels, said cam follower being maintained in contact with said fixed cam; a gripper shaft provided with a gripper, brackets securing said gripper, a gripper holder, and a gripper base adapted to clamp a printing sheet between said gripper and said gripper base, said cam lever shaft and said gripper shaft being rotatably supported by said brackets and being arranged parallel to each other; a gear-transmission mechanism for coupling said cam lever shaft and said gripper shaft so that said cam lever shaft and said gripper shaft are rotated relative to each other; said cylinder having an opening edge in which a locking groove is formed confronting said gripper base so that one end of a packing sheet is detachably lockable in said locking groove; and a bolt for tightening said brackets to and releasing said brackets from said cylinder, said bolt passing through a slot formed in one of said brackets extending in the direction of rotation of said brackets, said brackets when released being movable between a clamping and a non-clamping position within a range defined by said slot, said gripper base being in close proximity of said packing sheet when said brackets are in said clamping position and said gripper base being displaced from said packing sheet when said brackets are in said non-clamping position.